Etymology
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genus (n.)

(Latin plural genera), 1550s as a term of logic, "kind or class of things" (biological sense dates from c. 1600), from Latin genus (genitive generis) "race, stock, kind; family, birth, descent, origin" (from suffixed form of PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups).

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acer (n.)
maple tree genus, from Latin acer, of uncertain origin, perhaps from PIE *ak- "be sharp" (see acro-) and so called for its pointed leaves. There seem to have been two roots for "maple" in Indo-European; cognates of this one are said to include Old High German ahorn "maple," and there is a similar form in Greek akastos "maple," perhaps also Hittite hiqqar- "maple." De Vaan writes, "This may well be a non-PIE tree name which was borrowed into Greek and Latin."
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acescent (adj.)

"becoming sour," 1670s, from French acescent, from Latin acescentem (nominative acescens), present participle of acescere "become sour," from acer "sharp" (from PIE root *ak- "be sharp, rise (out) to a point, pierce").

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acervulus (n.)

"brain-sand" (anatomical), 1806, medical Latin, literally "little heap," diminutive of Latin acervus "heap," which is akin to acer "sharp" (from PIE root *ak- "be sharp, rise (out) to a point, pierce").

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selachian (adj.)

"cartilaginous fish resembling or related to a shark of the genus selachii," 1835; the genus name from Latinized form of Greek selakhos (plural selakhē) "cartilaginous fish," which is of uncertain origin.

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genotype (n.)
"genetic constitution of an individual," 1910, from German Genotypus (Wilhelm Johannsen, 1909); see gene + type (n.). Earlier the same word was used with a sense of "type-species of a genus" (1897); in this case, the first element is from genus.
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Morus (n.)
genus of mulberry trees, from Latin morus "mulberry tree."
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schistosome (n.)

"parasite of the genus Schistosoma" (1905); the genus name (1858) is a Modern Latin formation from Greek skhistos "divided, cloven" (from skhizein "to split;" see schizo-) + sōma "body" (see somato-). Related: Schistosomatosis "disease caused by schistosomes" (1906).

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Pilobolus (n.)

genus of fungi, Modern Latin, from Greek pilos "felt" (see pileated) + bōlos "a clod, clump."

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